237 cid

[Jim G]

Well there is no doubt that the engine in my Fargo is a replacement, and if I am reading my Motor's truck repair manual correct a 3 7/16ths bore makes it a 237. One of those mysteries I'll never know is why it got a transplant. I'm assuming the R in the engine serial number stands for rebuilt? the number on the boss on the block by the genny is the same as this. 

[Dozerman51]

The 25” 3&7/16 bore motors came in 3 stroke lengths, 3.25”(237), 3.50”(251) and 3.75”(265). Remove the timing plug near #6 cylinder, and use a thin rod inserted in the hole to measure the stroke. 

[Jim G]

20 minutes ago, Dozerman51 said:

The 25” 3&7/16 bore motors came in 3 stroke lengths, 3.25”(237), 3.50”(251) and 3.75”(265). Remove the timing plug near #6 cylinder, and use a thin rod inserted in the hole to measure the stroke. 

3? or 4?

my shop manual has a 4 1/4 stroke for the 237, but has a 3 7/16 x 3 1/4 for the 241 V8 

But yes, best to actualy measure, I wish I had written it down when Dad and I rebuilt that engine 20+ years ago.

 

[Dozerman51]

Yes I make big mistake. 4.25”, 4.50” and 4.75“. Old age . LOL

[Jim G]

1 hour ago, Dozerman51 said:

Yes I make big mistake. 4.25”, 4.50” and 4.75“. Old age . LOL

It happens, just wanted to confirm. I'm pretty sure it's a 237, but untill I measure I'm just guessing.